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add db_test for changing memtable size

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Summary:
The test only covers changing write_buffer_size. Other changable
parameters such bloom bits/probes are not obvious how to test.
Suggestions are welcome

Test Plan: db_test

Reviewers: sdong, yhchiang, igor

Reviewed By: igor

Subscribers: leveldb

Differential Revision: https://reviews.facebook.net/D24429
This commit is contained in:
Lei Jin 2014-10-07 10:40:45 -07:00
parent daab6dc511
commit 25f6a852e4
1 changed files with 51 additions and 0 deletions
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51
db/db_test.cc
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@ -8538,6 +8538,57 @@ TEST(DBTest, DisableDataSyncTest) {
}
}
TEST(DBTest, DynamicMemtableOptions) {
const uint64_t k64KB = 1 << 16;
const uint64_t k128KB = 1 << 17;
const uint64_t k5KB = 5 * 1024;
Options options;
options.env = env_;
options.create_if_missing = true;
options.compression = kNoCompression;
options.max_background_compactions = 4;
options.max_mem_compaction_level = 0;
options.write_buffer_size = k64KB;
options.max_write_buffer_number = 2;
// Don't trigger compact/slowdown/stop
options.level0_file_num_compaction_trigger = 1024;
options.level0_slowdown_writes_trigger = 1024;
options.level0_stop_writes_trigger = 1024;
DestroyAndReopen(&options);
auto gen_l0_kb = [this](int size) {
Random rnd(301);
std::vector<std::string> values;
for (int i = 0; i < size; i++) {
values.push_back(RandomString(&rnd, 1024));
ASSERT_OK(Put(Key(i), values[i]));
}
dbfull()->TEST_WaitForFlushMemTable();
};
gen_l0_kb(64);
ASSERT_EQ(NumTableFilesAtLevel(0), 1);
ASSERT_TRUE(SizeAtLevel(0) < k64KB + k5KB);
ASSERT_TRUE(SizeAtLevel(0) > k64KB - k5KB);
// Clean up L0
dbfull()->CompactRange(nullptr, nullptr);
ASSERT_EQ(NumTableFilesAtLevel(0), 0);
// Increase buffer size
ASSERT_TRUE(dbfull()->SetOptions({
{"write_buffer_size", "131072"},
}));
// The existing memtable is still 64KB in size, after it becomes immutable,
// the next memtable will be 128KB in size. Write 256KB total, we should
// have a 64KB L0 file, a 128KB L0 file, and a memtable with 64KB data
gen_l0_kb(256);
ASSERT_EQ(NumTableFilesAtLevel(0), 2);
ASSERT_TRUE(SizeAtLevel(0) < k128KB + k64KB + 2 * k5KB);
ASSERT_TRUE(SizeAtLevel(0) > k128KB + k64KB - 2 * k5KB);
}
TEST(DBTest, DynamicCompactionOptions) {
const uint64_t k64KB = 1 << 16;
const uint64_t k128KB = 1 << 17;